Investigation of asymmetrical shaft power increase during ship maneuvers by means of simulation techniques

Dubbioso, Giulio and Coraddu, A. and Viviani, M. and Figari, M. and Mauro, S. and Depascale, R. and Menna, A. and Manfredini, A.; (2010) Investigation of asymmetrical shaft power increase during ship maneuvers by means of simulation techniques. In: 11th International Symposium on Practical Design of Ships and Other Floating Structures, PRADS 2010. COPPE-URRJ, BRA, pp. 172-181. ISBN 9788528501407

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    Abstract

    Marine propulsion plants can experience large power fluctuations during tight maneuvers, with increases of shaft torque up to and over 100% of the steady values in straight course and considerable asymmetry between internal and external shafts during turning circle. This phenomenon (studied in Viviani et al 2007a and 2007b can be of particular interest for twin screw ships propulsion systems with coupled shaftlines, in which asymmetrical loads can represent a challenge for the whole propulsion system (e.g. unique reduction gear, shaftlines, automation). A joint research has been set up in order to deeply investigate the phenomenon, by means of large scale model testing and related numerical simulations. In the present work, preliminary simulation results with different simplified automation systems and with an automation system more similar to the real one are reported, allowing to get a better insight into this complex problem.